I start preparing several sketches and immunity zones are mentioned against 16" Q0 guns. It is needed to now that balance with USA is probably a little shifted towards smaller immunity zone on both sides, with UK it is more one sided in UK advantage.
Variants Ax - the cheapest version of 6 guns battleships with protection: 12.5" inclined belt, 3.5" deck, 14.5" turret faces, 6" turret tops, 4" CT, 2" secondaries, TDS lvl 2, 14x5" casemates guns, 10x4" DP guns, 18 LAA, 20 MAA
Variant A1 - 29200 tons, 27 knots, 3x2x16", 113M - minimal acceptable design
Variant A2 - 31900 tons, 29 knots, 3x2x16", 127M - speed increased to 29 knots
Variant A3 - 34200 tons, 30 knots, 3x2x16", 138M - speed increased to 30 knots, classified as BC
Variant A4 - 36300 tons, 31 knots, 3x2x16", 148M - speed increased to 31 knots, classified as BC
Variant A5 - 35100 tons, 29 knots, 3x2x17", 139M - speed increase to 29 knots, 17" guns
Variant A6 - 34700 tons, 27 knots, 7x17", 133M - change armament to 7x17" guns (322)
Immunity zone: 17300 - 20800 yards, turrets 16000 - 26000 yards
Variant Bx - moderate battleships with protection: 13" inclined belt, 4" deck, 15" turret faces, 6.5" turret tops, 4" CT, 2" secondaries, TDS lvl 4, 14x5" casemates guns, 10x4" DP guns, 16 LAA, 24 MAA
Variant B1 - 34100 tons, 27 knots, 3x2x16", 128M
Variant B2 - 39700 tons, 27 knots, 8x16", 149M - change armament to 8x16" guns (323)
Variant B3 - 42500 tons, 27 knots, 3x3x16", 160M - change armament to 3x3x16" guns
Variant B4 - 43500 tons, 27 knots, 8x17", 163M - change armament to 8x17" guns (323)
Variant B5 - 45000 tons, 29 knots, 7x17", 173M - change speed to 29 knots, armament to 7x17" guns (322)
Variant B6 - 44300 tons, 29 knots, 8x16", 171M - change speed to 29 knots, armament to 8x16" guns (323)
Immunity zone: 16400 - 23000 yards, turrets 15000 - 26800 yards
Variant Cx - large battleship with protection: 14" inclined belt, 5" deck, 17" turret faces, 8" turret tops, 16" CT, 2" secondaries, TDS lvl 4, 14x5" casemates, 10x4" DP guns, 18 LAA, 26 MAA
Variant C1 - 40500 tons, 27 knots, 3x2x16", 151M
Variant C2 - 46000 tons, 29 knots, 3x2x16", 176M - change to 29 knots
Variant C3 - 47500 tons, 27 knots, 8x16", 177M - change armament to 8x16" guns (323)
Variant C4 - 51100 tons, 27 knots, 3x3x16" guns, 190M - change armament to 3x3x16" guns
Variant C5 - 57500 tons, 29 knots, 3x3x16" guns, 220 M - change armament to 3x3x16" guns, speed to 29 knots
Variant C6 - 54500 tons, 29 knots, 7x17" guns, 207M - change armament to 7x17" guns (322), speed to 29 knots
Variant C7 - 56100 tons, 27 knots, 3x3x17" guns, 207M - change armament to 3x3x17" guns
Variant C8 - 48200 tons, 27 knots, 7x17" guns, 178M - change armament to 7x17" guns (322)
Variant C9 - 53000 tons, 27 knots, 3x3x16" guns, 197M - change armament to 3x3x16" guns, CT armour to 16.5"
Immunity zone: 13500 - 25000 yards, turrets 10900 - infinity